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Hi, Hope you dont mind me resurrecting this one: I have tried switching off all the radiators except one or two. In each case the radiators left on started to get much hotter although not as hot as they used to get. Only one of the radiators downstairs really failed to respond -...

Hi, Thanks to everyone for the comment and information. It looks like the installers may or may not have done a powerflush or alternatively just didnt put any inhibitor into the system leading to corrosion and gas. Would people recommend that I have a powerflsuh done now to solve...

It is a sealed system if fact and has had nothing done to it since the original installation. One radiator upstairs has frequently had air in it and I wonder if it has small holes where air is getting in. With air in the system I guess corosion would occur.

DS40 - is that a chemical desludger ? Do they work ?

The plumber put drains on two of the radiators first and flushed clean water out from them before eventually putting the drain on the return so it did seem to be travelling through at least to these two radiators. The water was initially very black although I have been told by the original...

I think they must be 8mm as both plumbers have commented that they are quite narrow although I did think that they had said 10mm rather than 8mm

Hi, I have a relatively new Worcester Bosch Combi system (3 years old). Worked perfectly until three weeks ago. But now none of the radiators get hot and some stay completely cold. I called in Worcester Bosch engineer. He says that it isnt a boiler problem. He is probably right because...